//----- Sự kiện Enter ------//
function doClick(buttonName,e)
    {
        var key;
        if(window.event)
            key = window.event.keyCode; // Enter in IE
        else
            key = e.which;              // Enter in FF
       if (key == 13)
        {           
            var btn = document.getElementById(buttonName);
            if (btn != null)
            { 
                btn.click();
                event.keyCode = 0
            }
        }
    }